Q4004L3

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Thyristors - TRIACs

A TRIAC is a three-terminal semiconductor device containing three electronic circuits connected in parallel that can be used to control the flow of current. The acronym TRIAC stands for Triode for Alternating Current. The TRIAC is a type of thyristor and is a versatile component that is widely used in both industrial and consumer applications including controlling the speed of motors and dimming lights. The TRIAC is a unidirectional device, which allows current to flow in only one direction and can switch between conducting and non-conducting states, making it an ideal product for controlling current and voltage.

Q4004L3 Application Field and Working Principle

The Q4004L3 is a TRIAC designed to control the flow of current in high power applications, such as motor speed control, industrial or commercial heating and cooling systems, and residential and industrial lighting. This device has a design that allows it to switch on and off at any angle of the sine wave, allowing it to be used in applications where an on/off control is needed. The Q4004L3 is built using a proprietary process that reduces the circuit size, increases switching speed, and decreases losses.

The Q4004L3 thyristor operates as a two-quadrant device, allowing current to flow from its positive main terminal, MT1, and the main terminal can be either positive or negative. Its gate, G, is a logic signal that acts as a switch to enable current flow. The device is triggered either actively, by applying a gate current through its gate terminal, or passively, by the natural waveform of the current flowing through it. And the Q4004L3 can operate in both AC and DC circuits.

When the device is actively triggered, its gate terminal is turned on by a voltage of up to 2V and current of up to 50mA. This causes the device to conduct current and the voltage on the gate terminal is blocked. When the gate current falls below the switching threshold, the TRIAC resumes its non-conducting state. When the device is passively triggered, the device is turned on by applying a voltage of up to 10V when the device is conducting with a positive main terminal, or up to 6V when the device is conducting with a negative main terminal.

When the TRIAC turns off, the device’s anode is at a higher potential than the gate and MT2, the current falls below the holding current, and the device turns off. The Q4004L3 can handle up to 400V and 4A in continuous conduction mode, offering a wide range of operation in applications such as switching, soft starting, and overload protection.

In summary, the Q4004L3 is a TRIAC designed to control the flow of current in high power applications. It is a two-quadrant device, allowing current to flow from its positive main terminal, MT1, or negative main terminal, and can be triggered either actively or passively. The device is capable of operating in both AC and DC circuits, is designed to handle up to 400V and 4A in continuous conduction mode, and can be used in applications such as switching, soft starting, and overload protection.

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